Comparison Between Asphaltenes (Sub)fractions Extracted From Two Different Asphaltic Residues: Chemical Characterization and Phase Behavior

Ferreira, Silas Rodrigues; Barreira, F.; Spinelli, Luciana S.; Leal, Kátia Zaccur; Seidl, Peter Rudolf; Lucas, Elizabete F.

doi:10.5935/0100-4042.20150172

Cited by 13 publications

(19 citation statements)

References 5 publications

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“…A general analysis of the data in Table 2 shows coherent results, since the particle sizes are considerably larger than those observed starting at the TOL:HEP ratio of 55:45 v/v, slightly lower than the precipitation onset identified by the NIR technique (TOLT:HEP of 50:50). In this respect, precipitation onset results of titration with n-heptane, obtained by optical microscopy (Garreto, et (Ferreira, et al, 2016), indicate that the start of precipitation occurs with addition of a slightly lower volume of n-heptane than that identified by the minimum absorbance point. Therefore, it is coherent to observe a significant increase in the asphaltenes particle size, corresponding to the formation of asphaltenes aggregates, in lower n-heptane volumes than that of the onset determined by NIR.…”

Section: Determination Of Asphaltene Particle Size By Atomic Force MImentioning

confidence: 99%

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The influence of chemicals on asphaltenes precipitation: a comparison between atomic force microscopy and near infrared techniques

Figueira

Simão

Soares

et al. 2017

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Asphaltenes can cause serious problems to petroleum industry. Indication of asphaltenes stability can be obtained by precipitation induced by n-heptane, monitored by near-infrared (NIR). However, this technique does not provide information on the particles sizes. In this study, the precipitation onset of model systems (1wt% asphaltenes in toluene) was monitored by NIR, with and without adding additive. The particles sizes of the same systems were monitored by atomic force microscopy (AFM): Dispersions of asphaltenes in toluene, n-heptane and mixtures of these two solvents were analyzed by AFM. For the pure model system, the size of the asphaltenes aggregates clearly increased in function of rising n-heptane concentration in the solvent mixture, with this increase being much more pronounced for solubility parameter values below that corresponding to the precipitation onset. In the presence of additives, significantly smaller particles were obtained even when the precipitation onset showed only a slight shift.

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Section: Determination Of Asphaltene Particle Size By Atomic Force MImentioning

confidence: 99%

“…Asphaltenes are considered to be more stable the greater the quantity of flocculant that is required to cause them to start precipitating. This point is called the precipitation onset ( (Ferreira, et al, 2016). The performance of chemical additives to inhibit deposition of asphaltenes can also be evaluated by these techniques.…”

Section: Introductionmentioning

confidence: 99%

The influence of chemicals on asphaltenes precipitation: a comparison between atomic force microscopy and near infrared techniques

Figueira

Simão

Soares

et al. 2017

revfue

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“…Asphaltenes are, relatively, the compounds with higher polarity and aromaticity of oils (Shadman et al, 2017;Ferreira et al, 2016;Honse et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Organic Deposition in Petroleum Storage Tanks at Refineries Due to Blending Operations

Camargo¹,

Ramos

Gatto³

et al. 2019

BJPG

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Petroleum blending is viewed as a critical optimization strategy adopted by several operations of petroleum production in the refineries around the world. A persistent problem called crude oil incompatibility occurs when the mixture of different oils lead to the formation of solid phases due to the precipitation of asphaltenes. The present work investigates the relationship between the occurrence of sludge in petroleum storage tanks and petroleum blending operations. Hildebrand solubility parameters of the oils were determined, revealing that one of the samples of petroleum analyzed is at the threshold of the asphaltene flocculation parameter, with an average of 16.1 Mpa 1/2. Thus, it implies that blending operations with dissimilar petroleum feedstocks must be well planned, since they can initiate the precipitation of the asphaltenes and, consequently, the formation of sludge that accumulate and deposit as sediments inside petroleum storage tanks.

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“…During crude oil refining in a fractionation Colum, the asphaltenes portion are not refined, staying cemented alongside with the resins. This refining deposit is called asphaltic residue [2], [3], [4], [5]. Asphaltene and resin can be isolated by dissolving them in non-polar solvents (paraffinic) such n-pentane or n-heptane, creating precipitates that liquefy in aromatic solvents such as toluene [6].…”

Section: Introductionmentioning

confidence: 99%

“…At the point when a substantial amount of aromatic solvent is available, molecular aggregates can be shaped in the scattered medium [18], [19], [20]. heptane, but insoluble in liquid propane [1], [5], [6]. Since the resins are defined as audibility class, overlap both to the aromatic and asphaltene fraction is expected.…”

Section: Introductionmentioning

confidence: 99%

Fractionation and characterization of Crude Oil Components from Al-Rashidiya Field - Eastern Baghdad using Chromatography Method

Farhan¹,

Mohammed²,

Abdul-Jaleel³

2017

KUJSS

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Study and separating of crude oil components from Al-Rashidiya field-Eastern Baghdad-Iraq was achieved. Samples were taken and separated into two important parts Asphaltene and Maltin (saturated, aromatic and resin). The separation was done by organic solvent such as n-hexane. Maltin separated by column chromatography technique (liquid-solid) to basic saturated, aromatic and resin components, this technique called (SARA) (saturated, aromatic, resin and asphaltene). Three absorption layers used, alumina layer Al 2 O 3 , silica SiO 2 and combination layer from Al 2 O 3 and SiO 2. All the components were collected dried and weighted. In order to determining the classification types, isolated compounds

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Comparison Between Asphaltenes (Sub)fractions Extracted From Two Different Asphaltic Residues: Chemical Characterization and Phase Behavior

Cited by 13 publications

References 5 publications

The influence of chemicals on asphaltenes precipitation: a comparison between atomic force microscopy and near infrared techniques

The influence of chemicals on asphaltenes precipitation: a comparison between atomic force microscopy and near infrared techniques

Organic Deposition in Petroleum Storage Tanks at Refineries Due to Blending Operations

Fractionation and characterization of Crude Oil Components from Al-Rashidiya Field - Eastern Baghdad using Chromatography Method

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